Was Jesus God coming into the world in human form?

If God is not external to life as theism projects, then God cannot invade the world in human form. That is an idea that grew up in Christianity and, in my mind, still distorts the meaning of Jesus. The early Christian writings suggest that God — the Holy external other — designated Jesus to be "son of God." That designation took place at his resurrection for Paul, as he writes in his letter to the Romans about the year 58. It took place at his baptism for Mark, who writes his gospel in the early 70's. The literal identity between Jesus and God that brought about such doctrines as the Incarnation and the Trinity are the products of the next three hundred years, and are based on what I regard as a Greek misreading of the Fourth Gospel. The claim of divinity for Jesus, or the suggestion that he is the second person of the Trinity, is unique to later Christianity. – John Shelby Spong

Jesus as God coming into the world in human form is something I have been taught since I took Lutheran Catechism classes as a child.  I hadn't thought about how this contradicts the recent understanding I have come to in my faith. That is why this quote is so notable to me.